Indigo (colour)

You may be looking for the plant or the Caxtarid named Indigo.

Indigo was a colour between violet and blue on the visible spectrum. (TV: Sky ^[+]Loading...["Sky (TV story)"])

Vortisaurs had indigo skin with stripes. (AUDIO: The Book of Kells ^[+]Loading...["The Book of Kells (audio story)"])

The Dalek Time Strategist's casing was indigo. (AUDIO: The Shadow Vortex ^[+]Loading...["The Shadow Vortex (audio story)"] - The Enigma Dimension ^[+]Loading...["The Enigma Dimension (audio story)"])